A brushless DC motor with high heat dissipation efficiency

Abstract

The invention discloses a brushless DC motor with high efficiency in heat dissipation, and relates to the technical field of brushless DC motors. The existing DC motor structure is optimized as a whole, and is specifically configured as a working outer shell and a protective inner shell. The essence of the invention is that the protective inner shell will not "hinder" the heat dissipation process during the operation of the motor, and the working outer shell relies on the mechanical movement during the operation of the motor to produce a directional rotation process, and utilizes a closed external absorption heat transfer method to transfer the heat generated during the operation of the motor through a hollow heat conduction ring and a straight heat conduction pipe. The heat dissipation process is completed under the basic condition of isolated heat dissipation based on the basic principle of heat exchange. During the whole process, the inside and outside of the motor are in an isolated state, thereby avoiding the inhalation of impurities during the heat dissipation process of the fan to affect the motor operation efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of brushless DC motors, and in particular to a brushless DC motor with high-efficiency heat dissipation. Background Art

[0002] Although the brushless DC motor does not have the carbon brushes in the traditional brushed DC motor, it still generates a certain amount of heat. This is because when the brushless DC motor is working normally, there is a certain resistance between the components inside the motor, which generates heat energy. This heat energy will be converted into temperature rise. In order to maintain the stable operation of the internal structure, a heat dissipation structure needs to be added. The current heat dissipation structure is based on the main shaft of the brushless current motor and adds structures such as cooling fans.

[0003] It should be noted that if fans are used for heat dissipation, heat energy will be transferred as the air flows, and tiny impurities in the external environment will be "sucked" into the motor, which will directly affect the rotor, stator and other structures inside the motor and affect the motor's operating efficiency.

[0004] In view of the above technical problems, this application proposes a solution. Summary of the invention

[0005] The purpose of the present invention is to provide a brushless DC motor with efficient heat dissipation, which is used to solve the problem that the high heat environment generated by the existing brushless motor during its operation directly affects its operating stability. If a single fan is used for heat dissipation, it may inhale external impurities and affect the motor operating efficiency.

[0006] The object of the present invention can be achieved by the following technical scheme: A brushless DC motor with high efficiency heat dissipation, comprising a mounting base and a protective inner shell, wherein the protective inner shell is mounted on the mounting base, and a stator is fixedly mounted inside the protective inner shell, a rotor is arranged in the stator, a transmission main shaft is mounted at the center point of the rotor, and a turbo fan is mounted on the transmission main shaft;

[0007] A working outer shell is rotatably mounted on the mounting base, the working outer shell is located outside the protective inner shell, a plurality of empty slots are provided on the protective inner shell, the transmission main shaft passes through the center point of the protective inner shell and extends to the outer position of the working outer shell, and a gear set is provided between the transmission main shaft and the protective inner shell;

[0008] A plurality of hollow heat-conducting rings and straight heat-conducting pipes are installed on the working shell, the hollow heat-conducting rings are linearly and equidistantly arranged along the length direction of the working shell, the straight heat-conducting pipes are arranged in a ring array along the center point of the working shell, and one end of the straight heat-conducting pipe is connected to the hollow heat-conducting ring, one end of the straight heat-conducting pipe passes through and extends to the outside position of the working shell, and one end of the straight heat-conducting pipe is open;

[0009] The hollow heat-conducting ring is respectively provided with an upper wave crest and a lower wave crest, and a semi-vent is opened at the position of the hollow heat-conducting ring corresponding to the upper wave crest, and the lower wave crest is located in the middle position of the working outer shell and the protective inner shell, and the upper wave crest and the lower wave crest are respectively in the shape of curved arcs toward the outside and the inside.

[0010] It is further configured as follows: the gear set consists of an outer ring gear, a driving gear and three planetary gears, the driving gear is installed on the transmission main shaft, the outer ring gear is installed on the inner wall of the working shell, the planetary gears are respectively meshed with the outer ring gear and the driving gear, and the planetary gears are rotationally connected on the outer wall of the protective inner shell.

[0011] It is further configured as follows: one end of the straight heat pipe is flush with the outer wall of the working shell, a semi-elliptical parallel notch is opened at the position of the straight heat pipe on the working shell, and a vent is opened at one end of the straight heat pipe.

[0012] It is further configured that: a plurality of expansion air bags are installed at positions inside the working shell corresponding to the straight heat conducting pipe.

[0013] It is further configured as follows: every two adjacent hollow heat-conducting rings are staggered at equal angles, and the straight heat-conducting pipe is connected to the hollow heat-conducting ring through the lower wave crest.

[0014] It is further configured as follows: the curvature of the upper wave crest is greater than the curvature of the lower wave crest.

[0015] The present invention has the following beneficial effects:

[0016] 1. The overall structure is a secondary optimization of the current DC motor structure. Specifically, the overall shell structure is set as a working shell and a protective inner shell, wherein the protective inner shell is only used as a mounting structure for the internal structure of the motor and will not "hinder" the heat dissipation process during the operation of the motor. The working shell depends on the mechanical operation during the operation of the motor to produce a directional rotation process, and cooperates with the hollow heat conduction ring and the straight heat conduction pipe to make the overall structure form a closed external absorption heat transfer mode. Its purpose is: not relying on the heat loss process generated by the turbofan, but based on the isolated heat exchange principle, the internal heat of the motor is transferred to the external environment through the hollow heat conduction ring and the straight heat conduction pipe, and the external environment is not directly connected to the inside of the motor, thereby preventing impurities in the external environment from entering the motor and affecting the motor operation efficiency;

[0017] 2. It should also be noted that the secondary optimization of the hollow heat-conducting ring is essentially based on the working shell cooperating with the flow of air in the external environment during directional rotation, so that the external air passively flows into the hollow heat-conducting ring to "replace" the hot air flow inside it, or uses the pressure generated by negative pressure suction to "extract" the hot air flow inside the straight heat-conducting pipe. The ultimate goal is to dissipate the heat source inside the motor in an isolated manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a structural schematic diagram of a brushless DC motor with high efficiency heat dissipation proposed by the present invention;

[0020] Figure 2 A brushless DC motor with high efficiency heat dissipation proposed by the present invention Figure 1 Split diagram of ;

[0021] Figure 3 This is a disassembled diagram of a protective inner shell in a brushless DC motor with high efficiency heat dissipation proposed by the present invention;

[0022] Figure 4 A cross-sectional view of a working housing and a protective inner housing in a brushless DC motor with high efficiency heat dissipation proposed by the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of a gear set in a brushless DC motor with high efficiency heat dissipation proposed by the present invention;

[0024] Figure 6 A cross-sectional view of a working housing of a brushless DC motor with high efficiency heat dissipation proposed by the present invention;

[0025] Figure 7 This is a front view of a hollow heat-conducting ring in a brushless DC motor with high heat dissipation proposed by the present invention.

[0026] In the figure: 1. mounting base; 2. working housing; 3. transmission main shaft; 4. stator; 5. protective inner shell; 6. turbofan; 7. rotor; 8. parallel notches; 9. outer ring gear; 10. planetary gear; 11. driving gear; 12. hollow heat transfer ring; 1201. upper wave crest; 1202. lower wave crest; 13. air vent; 14. expansion airbag; 15. straight heat transfer pipe; 16. semi-vent. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Embodiment 1

[0029] For brushless motors, if fans are used for heat dissipation, heat energy will be transferred as the air flows, and tiny impurities in the external environment will be "sucked" into the motor, which will directly affect the rotor, stator and other structures inside the motor and affect the motor's operating efficiency. The following technical solutions are proposed:

[0030] Reference Figures 1 to 7 In this embodiment, a brushless DC motor with high efficiency in heat dissipation comprises a mounting base 1 and a protective inner shell 5, wherein the protective inner shell 5 is mounted on the mounting base 1, and a stator 4 is fixedly mounted inside the protective inner shell 5, a rotor 7 is arranged in the stator 4, a transmission main shaft 3 is mounted at the center point of the rotor 7, and a turbo fan 6 is mounted on the transmission main shaft 3;

[0031] A working shell 2 is rotatably mounted on the mounting base 1, and the working shell 2 is located outside the protective inner shell 5. The protective inner shell 5 is provided with a plurality of empty slots. The transmission main shaft 3 passes through the center point of the protective inner shell 5 and extends to the outside of the working shell 2. The transmission main shaft 3 is located between the working shell 2 and the protective inner shell 5 and a gear set is provided.

[0032] A plurality of hollow heat-conducting rings 12 and straight heat-conducting pipes 15 are installed on the working shell 2. The hollow heat-conducting rings 12 are linearly and equidistantly arranged along the length direction of the working shell 2. The straight heat-conducting pipes 15 are arranged in a circular array along the center point of the working shell 2. One end of the straight heat-conducting pipe 15 is connected to the hollow heat-conducting ring 12. One end of the straight heat-conducting pipe 15 penetrates and extends to the outside position of the working shell 2. One end of the straight heat-conducting pipe 15 is open.

[0033] The hollow heat-conducting ring 12 is respectively provided with an upper crest 1201 and a lower crest 1202, and a semi-vent 16 is opened at the position of the hollow heat-conducting ring 12 corresponding to the upper crest 1201, and the lower crest 1202 is located in the middle position between the working outer shell 2 and the protective inner shell 5, and the upper crest 1201 and the lower crest 1202 are respectively curved arc shapes toward the outside and the inside.

[0034] The gear set consists of an outer ring gear 9, a driving gear 11 and three planetary gears 10. The driving gear 11 is installed on the transmission main shaft 3, the outer ring gear 9 is installed on the inner wall of the working housing 2, the planetary gears 10 are meshed with the outer ring gear 9 and the driving gear 11 respectively, and the planetary gears 10 are rotatably connected to the outer wall of the protective inner housing 5.

[0035] Basic principle: Refer to Figure 2 In other words, the overall motor structure is composed of a protective inner shell 5 combined with a rotor 7 and a stator 4. The difference is that the protective inner shell 5 is not a traditional fully enclosed structure, but a plurality of empty slots are provided. Then, in actual use, the rotor 7 is directional rotated by the stator 4, which also drives the turbofan 6 to rotate. By selecting the structural shape of the turbofan 6, the turbofan 6 generates wind force to the outside, and then the heat generated by the rotor 7 and the stator 4 during operation can be "extracted" to the outside of the protective inner shell 5.

[0036] In this regard, on the basis of protecting the inner shell 5, a working shell 2 is added outside the inner shell 5. The working shell 2 is a fully enclosed structure, which is mainly used to isolate the external environment from the internal working environment of the motor to prevent impurities in the external environment from entering the rotor 7 and the stator 4.

[0037] The main thing to note is: Figure 4 and Figure 4 When the transmission main shaft 3 rotates synchronously with the rotor 7, the three planetary gears 10 are driven to rotate through the synchronously rotating driving gear 11, and the meshing relationship between the gears is utilized to finally drive the outer ring gear 9 to rotate at a reduced speed, so that the working housing 2 rotates at a uniform speed. The rotation speed of the working housing 2 is always lower than the rotation speed of the transmission main shaft 3.

[0038] Embodiment 2

[0039] This embodiment is to optimize the straight heat pipe in the first embodiment:

[0040] One end of the straight heat pipe 15 is flush with the outer wall of the working shell 2, and a semi-elliptical parallel notch 8 is opened at the position of the working shell 2 corresponding to the straight heat pipe 15, a vent 13 is opened at one end of the straight heat pipe 15, and a plurality of expansion air bags 14 are installed at the internal position of the working shell 2 corresponding to the straight heat pipe 15.

[0041] Solution Description: Refer to Figure 6Explanation: The essence of the plurality of straight conduits 15 is a hollow copper tube. According to the technical content shown in the first embodiment, during the continuous operation of the motor, the turbofan 6 concentrates the heat at the middle position between the working shell 2 and the protective inner shell 2. In theory, the heat cannot be dissipated to the outside of the working shell 2. However, during the actual use, the inside of the straight conduit 15 is not connected to the inside of the motor, but is connected to the external environment. Therefore, during the high-speed rotation of the working shell 2, the external air is "concentrated" along the parallel notch 8 at the open end of the straight conduit 15. In this process, It can be understood that: the straight duct 15 is in a relatively static state, and the airflow in the external environment flows at a high speed at the opening position of the straight duct 15, thereby forming a structure similar to "negative pressure suction", and the airflow inside the straight duct 15 is continuously sucked out to the external environment. However, in this process, according to the principle of heat exchange, the airflow inside the straight duct 15 will be "heated" by the high-temperature environment inside the motor, so it can be directly understood that: after sucking out the "heated" airflow, the heat inside the motor will also be dissipated to the external environment, but the inside of the motor is not always connected to the external environment;

[0042] It is further explained that: a plurality of expansion airbags 14 are added in the straight duct 15. The purpose of the expansion airbags 14 is to increase the storage space for the airflow, but the volume will also shrink as the internal temperature of the motor rises. Thus, through the change in the volume of the expansion airbags 14, the effect of "actively" expanding the hot airflow inside the straight duct 15 is achieved.

[0043] Embodiment 3

[0044] This embodiment is an optimization explanation of the hollow heat-conducting ring in the first embodiment:

[0045] Every two adjacent hollow heat-conducting rings 12 are staggered at equal angles, and the straight heat-conducting pipe 15 is connected to the hollow heat-conducting ring 12 through the lower wave crest 1202 . The curvature of the upper wave crest 1201 is greater than that of the lower wave crest 1202 .

[0046] Solution description: The essence of the hollow heat-conducting ring 12 in this embodiment is roughly similar to the principle of the straight conduit 15, except that: a plurality of upper wave crests 1201 and lower wave crests 1202 arranged in an interlaced manner are added to the hollow heat-conducting ring 12, so that the hollow heat-conducting ring 12 is not a ring in the literal sense, but presents a wave-like ring. In this process, the upper wave crests 1201 are exposed outside the working shell 2 and a semi-ventilation port 16 is opened, while the lower wave crests 1202 are always located inside the working shell 2 and the protective inner shell 5;

[0047] In combination with the technical content in the second embodiment, it is explained that: when the working housing 2 rotates, the external airflow at the semi-vent 16 will also produce a similar "negative pressure suction" structure, but what is different from the second embodiment is that the lower wave crest 1202 is a direct structure for directly receiving the heat inside the motor, so that the airflow inside the lower wave crest 1202 is continuously "heated", and then the "heated" airflow is sucked out to the external environment;

[0048] It should be noted that: the degree of curvature between the upper peak 1201 and the lower peak 1202 needs to be further limited, specifically, the curvature of the upper peak 1201 is greater than the curvature of the lower peak 1202. The reason is: because the curvature of the upper peak 1201 is larger, the resistance of the airflow through the upper peak 1201 is lower than the resistance of the airflow through the lower peak 1202. Therefore, when the external airflow "sucks out" the hot airflow inside the lower peak 1202, it will not directly suck out the "heated" airflow, but will allow the airflow inside the lower peak 1202 to have "enough" time to be heated, so that the heat inside the motor is transferred to the hollow heat conductive ring 12 and replaced into the external environment.

[0049] To sum up: the current DC motor structure is optimized as a whole, and is specifically set up as a working outer shell and a protective inner shell. Its essence is: the protective inner shell will not "hinder" the heat dissipation process during the operation of the motor, and the working outer shell relies on the mechanical movement during the operation of the motor to produce a directional rotation process, and utilizes a closed external absorption heat transfer method to transfer the heat generated during the operation of the motor through the hollow heat conduction ring and the straight heat conduction pipe. The heat dissipation process is completed under the basic conditions of isolated heat dissipation based on the basic principle of heat exchange. During the whole process, the inside and outside of the motor are in an isolated state, thereby avoiding the inhalation of impurities during the fan heat dissipation process and affecting the motor operation efficiency.

[0050] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A brushless DC motor with high heat dissipation efficiency, comprising a mounting base (1) and a protective inner shell (5), It is characterized in that The protective inner shell (5) is mounted on the mounting base (1), and a stator (4) is fixedly mounted inside the protective inner shell (5), a rotor (7) is arranged in the stator (4), a transmission main shaft (3) is mounted at the center point of the rotor (7), and a turbo fan (6) is mounted on the transmission main shaft (3); A working outer shell (2) is rotatably mounted on the mounting base (1), the working outer shell (2) is located outside the protective inner shell (5), a plurality of empty slots are provided on the protective inner shell (5), the transmission main shaft (3) passes through the central point of the protective inner shell (5) and extends to the outside of the working outer shell (2), and a gear set is provided between the transmission main shaft (3) and the protective inner shell (5); A plurality of hollow heat-conducting rings (12) and straight heat-conducting pipes (15) are installed on the working shell (2); the hollow heat-conducting rings (12) are arranged linearly and equidistantly along the length direction of the working shell (2); the straight heat-conducting pipes (15) are arranged in a ring array along the center point of the working shell (2); one end of the straight heat-conducting pipe (15) is connected to the hollow heat-conducting ring (12); one end of the straight heat-conducting pipe (15) penetrates and extends to a position outside the working shell (2); and one end of the straight heat-conducting pipe (15) is open; The hollow heat-conducting ring (12) is respectively provided with an upper wave crest (1201) and a lower wave crest (1202), and a semi-ventilation opening (16) is provided at a position of the hollow heat-conducting ring (12) corresponding to the upper wave crest (1201), the lower wave crest (1202) is located in the middle position of the working outer shell (2) and the protective inner shell (5), and the upper wave crest (1201) and the lower wave crest (1202) are respectively in the shape of an arc curved outward and inward; The gear set is composed of an outer ring gear (9), a driving gear (11) and three planetary gears (10); the driving gear (11) is mounted on the transmission main shaft (3); the outer ring gear (9) is mounted on the inner wall of the working housing (2); the planetary gears (10) are respectively meshed with the outer ring gear (9) and the driving gear (11); and the planetary gears (10) are rotationally connected to the outer wall of the protective inner housing (5); One end of the straight heat-conducting pipe (15) is flush with the outer wall of the working shell (2); a semi-elliptical parallel notch (8) is provided at a position of the working shell (2) corresponding to the straight heat-conducting pipe (15); a vent (13) is provided at one end of the straight heat-conducting pipe (15); a plurality of expansion air bags (14) are installed at a position inside the working shell (2) corresponding to the straight heat-conducting pipe (15); each two adjacent hollow heat-conducting rings (12) are staggered at equal angles; the straight heat-conducting pipe (15) is connected to the hollow heat-conducting ring (12) through the lower wave crest (1202); and the curvature of the upper wave crest (1201) is greater than the curvature of the lower wave crest (1202).

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